Siemens sinumerik 840D sl Function Manual page 453

Detailed description
2.3 Limit angle
Activation
If the current offset angle is outside the active working area limit for the following axis, an
attempt is made to return to within the permissible working area by means of the negative
offset angle. This response corresponds to that shown in the lower diagram of the above Fig.
16
Special functions: Tangential Control (T3)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0